title: Effect of intermediate ceramics and firing temperature on bond strength between tetragonal zirconia polycrystal and veneering ceramics.
abstract: The purpose of the present study was to investigate the influence of the intermediate ceramics and firing temperature on bond strength between tetragonal zirconia polycrystal (TZP) and its intermediate ceramics. Two types of intermediate ceramics, defined as a ceramics placed between the TZP and its veneering ceramics, were used; one including high-strength lithium-disilicate (EP) or feldspathic liner porcelain (SB). The firing temperature of the intermediate ceramics was set at 930°C, 945°C or 960°C. Shear bond strength showed values of 35.8 MPa in SB and 54.9 MPa in EP at a firing temperature of 960°C. Electron probe microanalysis revealed that components of the intermediate ceramics remained on the TZP surface after debonding, indicating that fractures occurred in the intermediate ceramics near the TZP. These results indicate that the bond strength between and a TZP framework and its veneering ceramics could be improved by using a high-strength intermediate ceramics and a comparatively high firing temperature.
authors.affiliation: Division of Oral Implants Research, Oral Health Science Center, Tokyo Dental College.
authors.forename: Naoya
authors.initials: N
authors.lastname: Matsumoto
authors.forename: Masao
authors.initials: M
authors.lastname: Yoshinari
authors.forename: Shinji
authors.initials: S
authors.lastname: Takemoto
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hattori
authors.forename: Eiji
authors.initials: E
authors.lastname: Kawada
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Oda
mesh_terms: D002516:Ceramics; D003460:Crystallization; D003801:Dental Veneers; D004577:Electron Probe Microanalysis; D006358:Hot Temperature; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D015040:Zirconium / Q000737:chemistry*
chemical_list: D015040:Zirconium